4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. With blocking of normal usage

Dmitry Levitan

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Digital telephone system noise reduction circuit

Telephonic communications – Subscriber line or transmission line interface
Patent

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Method and apparatus for off-hook management of plural...

Telephonic communications – Substation or terminal circuitry – Hold circuit
Reexamination Certificate

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Two-wire channel unit with loopback test capability

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Profile ID: LFUS-PAI-P-347775

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